Gear-wheel.



l. S. DUNLAP.

GEAR WHEEL. APPLICATION FILED MAR. 3o. Isis.

Patented Sept. 26, 1916.

-Jmvi A mmv-ummm" STATES PATENT OFFICE- -Jomr s. Dimmi, or cnrcaeo',rumors.

' `e nan-winrar..

To all t may concern:

Be it known that I, JOHN S. D UNLAr, acitizen of the Unitedy States,residing at Chicago, in the county of Cook and State' of Illinois, haveinvented a new'and useful Improvement in Gear-Wheels, of which thefollowing' is a specification.

The object of my. invention isto enable a superior gear-wheel to be somade of'very thin and cheap sheet-metal that it will be reinforced bythemannerof providing it with gear-teeth, and be thus rendered as strongas one made of .much heavier and more expensive sheet-metal; andthe-'teeth will incidentally be hardened and, besides,

afford pockets tending to retain the lubriw cant employed in driving it.

lVheels of the type to which my improvement relates are used, mainly, ingearing for relatively light work, such -formed by beatersemployed forculinary manipulations, like the beater of my Patent No. 820,405,dated-May 15, 1906, for which particular use I have more especiallydevised the present gear.- A commercial requirement of such light gearsis cheapness of construction, but not at the' expense-of strength anddurability; anda gear of my improved construction possesses the desira.`ble quality of cheapness, and is as strong and durable as .other gearsof the same class made ofrelatively heavy and expensive sheet-metal.

teeth, the radial corrugations about the opl asv is' per- Specificationof Letters Patent. l Application led Hatch 30, 1916. Serial No.l

'Infthe accompanying drawing, Figure 1i i Patented sept. 26, 1916.

positeaces of theN wheel, near its periphery, reinforce the thin'sheet-metalVand render 1t as strong andrigid as the same metal ofmuchheavier'gage, and adapt it to reffectually resist exlng under thestrains to' which it is subjected in` use.-

lTo illustrate one application of my im? i proved gear-wheel, it i'sshown. to be journaled at its center upon the stem 6 of a handle 7,',theHat-metal stem being bent to form a rectangular bracket 8, in which Aisjournaled a shaft' 9 carrying within the bracket a pinion 10 meshingwith the gear- 4teeth'5 -in the face of the disk inside itscircumferential edge-portion, rotation of which dish-through the medium`of a crank 11 on its opposite face, drives the 'pinion' 'to rotate theshaft, which may carry a dasher orkother desireddevice' (not shown) `onits lower or innerend. The depressions in producing between the teeth-5, formed the reinforcing radial corrugations affording thegear-teeth-by the die-pressure,` provide pockets 12 tending to retainthe. lubricant used for the coperating Agear and pinion, and thus to'holdthe supply and en` hance its effectiveness;A and. drawing of themetal by the die-pressure employed for producing the reinforcingtooth-forming cor'- rugatlons tends to harden it there and thus increasethe wearing quality of the teeth, and, consequently, theV durability ofthe gear. The upturned extremity. of. the bracket 8 extends transverselyacross the plane ms ginal portion of the disk about the corru gationstherein to tend tokprevent springing. I

of the gear-teeth away from thepinion 1n the rotation of the wheel.v s

What I claim as new and desire to secure by Letters Patent is: Agear-wheel ofthi'n sheet-metal ,having stamped radially-extendingreinforcing cor. rugations about its opposite faces," forming thegear-teeth, .and a tion about Asaid corri ations.'

HNS. 'DUNLAR plane marginal por-

